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Sister Thomasina is a Roman Catholic nun and teacher at St. Jerome's Catholic School.
After Bart was blamed for a prank he didn't commit which was actually really caused by Groundskeeper Willie who should have been fired, and was expelled from Springfield Elementary by Principal Skinner who mistakenly blamed Groundskeeper Willie's prank on Bart, Marge enrolled him to St. Jerome's Catholic School. During the first lesson, his teacher Sister Thomasina was shocked by Bart's rebel behavior and told him to hold out two dictionaries. Later, Father Sean comes to convert Bart to Catholic